So you've got Pythons, you've got Boas and you've got Anacondas. All three are fairly famous varieties of constrictor type snakes. All three are subclasses of the Boa. Same applies to Crows, Ravens and Magpies.

Basically Jays and Magpies and that sort are Corvidae, Crows and stuff are Corvus. Jays and Magpies used to be a part of the Corvus but with the discovery of new species they were given their own genus. I have a guide to Australian birds open on my lap right now so don't try and correct me because you'd be wrong.